security/nss/lib/freebl/mpi/mpi_arm.c@b8a032363ba2 (annotated)
security/nss/lib/freebl/mpi/mpi_arm.c
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | |
| michael@0 | 5 | /* This inlined version is for 32-bit ARM platform only */ |
| michael@0 | 6 | |
| michael@0 | 7 | #if !defined(__arm__) |
| michael@0 | 8 | #error "This is for ARM only" |
| michael@0 | 9 | #endif |
| michael@0 | 10 | |
| michael@0 | 11 | /* 16-bit thumb doesn't work inlined assember version */ |
| michael@0 | 12 | #if (!defined(__thumb__) || defined(__thumb2__)) && !defined(__ARM_ARCH_3__) |
| michael@0 | 13 | |
| michael@0 | 14 | #include "mpi-priv.h" |
| michael@0 | 15 | |
| michael@0 | 16 | #ifdef MP_ASSEMBLY_MULTIPLY |
| michael@0 | 17 | void s_mpv_mul_d(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c) |
| michael@0 | 18 | { |
| michael@0 | 19 | __asm__ __volatile__( |
| michael@0 | 20 | "mov r5, #0\n" |
| michael@0 | 21 | #ifdef __thumb2__ |
| michael@0 | 22 | "cbz %1, 2f\n" |
| michael@0 | 23 | #else |
| michael@0 | 24 | "cmp %1, r5\n" /* r5 is 0 now */ |
| michael@0 | 25 | "beq 2f\n" |
| michael@0 | 26 | #endif |
| michael@0 | 27 | |
| michael@0 | 28 | "1:\n" |
| michael@0 | 29 | "mov r4, #0\n" |
| michael@0 | 30 | "ldr r6, [%0], #4\n" |
| michael@0 | 31 | "umlal r5, r4, r6, %2\n" |
| michael@0 | 32 | "str r5, [%3], #4\n" |
| michael@0 | 33 | "mov r5, r4\n" |
| michael@0 | 34 | |
| michael@0 | 35 | "subs %1, #1\n" |
| michael@0 | 36 | "bne 1b\n" |
| michael@0 | 37 | |
| michael@0 | 38 | "2:\n" |
| michael@0 | 39 | "str r5, [%3]\n" |
| michael@0 | 40 | : |
| michael@0 | 41 | : "r"(a), "r"(a_len), "r"(b), "r"(c) |
| michael@0 | 42 | : "memory", "cc", "%r4", "%r5", "%r6"); |
| michael@0 | 43 | } |
| michael@0 | 44 | |
| michael@0 | 45 | void s_mpv_mul_d_add(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c) |
| michael@0 | 46 | { |
| michael@0 | 47 | __asm__ __volatile__( |
| michael@0 | 48 | "mov r5, #0\n" |
| michael@0 | 49 | #ifdef __thumb2__ |
| michael@0 | 50 | "cbz %1, 2f\n" |
| michael@0 | 51 | #else |
| michael@0 | 52 | "cmp %1, r5\n" /* r5 is 0 now */ |
| michael@0 | 53 | "beq 2f\n" |
| michael@0 | 54 | #endif |
| michael@0 | 55 | |
| michael@0 | 56 | "1:\n" |
| michael@0 | 57 | "mov r4, #0\n" |
| michael@0 | 58 | "ldr r6, [%3]\n" |
| michael@0 | 59 | "adds r5, r6\n" |
| michael@0 | 60 | "adc r4, r4, #0\n" |
| michael@0 | 61 | |
| michael@0 | 62 | "ldr r6, [%0], #4\n" |
| michael@0 | 63 | "umlal r5, r4, r6, %2\n" |
| michael@0 | 64 | "str r5, [%3], #4\n" |
| michael@0 | 65 | "mov r5, r4\n" |
| michael@0 | 66 | |
| michael@0 | 67 | "subs %1, #1\n" |
| michael@0 | 68 | "bne 1b\n" |
| michael@0 | 69 | |
| michael@0 | 70 | "2:\n" |
| michael@0 | 71 | "str r5, [%3]\n" |
| michael@0 | 72 | : |
| michael@0 | 73 | : "r"(a), "r"(a_len), "r"(b), "r"(c) |
| michael@0 | 74 | : "memory", "cc", "%r4", "%r5", "%r6"); |
| michael@0 | 75 | } |
| michael@0 | 76 | |
| michael@0 | 77 | void s_mpv_mul_d_add_prop(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c) |
| michael@0 | 78 | { |
| michael@0 | 79 | if (!a_len) |
| michael@0 | 80 | return; |
| michael@0 | 81 | |
| michael@0 | 82 | __asm__ __volatile__( |
| michael@0 | 83 | "mov r5, #0\n" |
| michael@0 | 84 | |
| michael@0 | 85 | "1:\n" |
| michael@0 | 86 | "mov r4, #0\n" |
| michael@0 | 87 | "ldr r6, [%3]\n" |
| michael@0 | 88 | "adds r5, r6\n" |
| michael@0 | 89 | "adc r4, r4, #0\n" |
| michael@0 | 90 | "ldr r6, [%0], #4\n" |
| michael@0 | 91 | "umlal r5, r4, r6, %2\n" |
| michael@0 | 92 | "str r5, [%3], #4\n" |
| michael@0 | 93 | "mov r5, r4\n" |
| michael@0 | 94 | |
| michael@0 | 95 | "subs %1, #1\n" |
| michael@0 | 96 | "bne 1b\n" |
| michael@0 | 97 | |
| michael@0 | 98 | #ifdef __thumb2__ |
| michael@0 | 99 | "cbz r4, 3f\n" |
| michael@0 | 100 | #else |
| michael@0 | 101 | "cmp r4, #0\n" |
| michael@0 | 102 | "beq 3f\n" |
| michael@0 | 103 | #endif |
| michael@0 | 104 | |
| michael@0 | 105 | "2:\n" |
| michael@0 | 106 | "mov r4, #0\n" |
| michael@0 | 107 | "ldr r6, [%3]\n" |
| michael@0 | 108 | "adds r5, r6\n" |
| michael@0 | 109 | "adc r4, r4, #0\n" |
| michael@0 | 110 | "str r5, [%3], #4\n" |
| michael@0 | 111 | "movs r5, r4\n" |
| michael@0 | 112 | "bne 2b\n" |
| michael@0 | 113 | |
| michael@0 | 114 | "3:\n" |
| michael@0 | 115 | : |
| michael@0 | 116 | : "r"(a), "r"(a_len), "r"(b), "r"(c) |
| michael@0 | 117 | : "memory", "cc", "%r4", "%r5", "%r6"); |
| michael@0 | 118 | } |
| michael@0 | 119 | #endif |
| michael@0 | 120 | |
| michael@0 | 121 | #ifdef MP_ASSEMBLY_SQUARE |
| michael@0 | 122 | void s_mpv_sqr_add_prop(const mp_digit *pa, mp_size a_len, mp_digit *ps) |
| michael@0 | 123 | { |
| michael@0 | 124 | if (!a_len) |
| michael@0 | 125 | return; |
| michael@0 | 126 | |
| michael@0 | 127 | __asm__ __volatile__( |
| michael@0 | 128 | "mov r3, #0\n" |
| michael@0 | 129 | |
| michael@0 | 130 | "1:\n" |
| michael@0 | 131 | "mov r4, #0\n" |
| michael@0 | 132 | "ldr r6, [%0], #4\n" |
| michael@0 | 133 | "ldr r5, [%2]\n" |
| michael@0 | 134 | "adds r3, r5\n" |
| michael@0 | 135 | "adc r4, r4, #0\n" |
| michael@0 | 136 | "umlal r3, r4, r6, r6\n" /* w = r3:r4 */ |
| michael@0 | 137 | "str r3, [%2], #4\n" |
| michael@0 | 138 | |
| michael@0 | 139 | "ldr r5, [%2]\n" |
| michael@0 | 140 | "adds r3, r4, r5\n" |
| michael@0 | 141 | "mov r4, #0\n" |
| michael@0 | 142 | "adc r4, r4, #0\n" |
| michael@0 | 143 | "str r3, [%2], #4\n" |
| michael@0 | 144 | "mov r3, r4\n" |
| michael@0 | 145 | |
| michael@0 | 146 | "subs %1, #1\n" |
| michael@0 | 147 | "bne 1b\n" |
| michael@0 | 148 | |
| michael@0 | 149 | #ifdef __thumb2__ |
| michael@0 | 150 | "cbz r3, 3f\n" |
| michael@0 | 151 | #else |
| michael@0 | 152 | "cmp r3, #0\n" |
| michael@0 | 153 | "beq 3f\n" |
| michael@0 | 154 | #endif |
| michael@0 | 155 | |
| michael@0 | 156 | "2:\n" |
| michael@0 | 157 | "mov r4, #0\n" |
| michael@0 | 158 | "ldr r5, [%2]\n" |
| michael@0 | 159 | "adds r3, r5\n" |
| michael@0 | 160 | "adc r4, r4, #0\n" |
| michael@0 | 161 | "str r3, [%2], #4\n" |
| michael@0 | 162 | "movs r3, r4\n" |
| michael@0 | 163 | "bne 2b\n" |
| michael@0 | 164 | |
| michael@0 | 165 | "3:" |
| michael@0 | 166 | : |
| michael@0 | 167 | : "r"(pa), "r"(a_len), "r"(ps) |
| michael@0 | 168 | : "memory", "cc", "%r3", "%r4", "%r5", "%r6"); |
| michael@0 | 169 | } |
| michael@0 | 170 | #endif |
| michael@0 | 171 | #endif |
